Wobbley;
Good question. The best and only way is to have someone in the car painting business to match to color, Anthracite in my case, and touch it up. A pain, but that's pretty much all you can do. Seymour sells a stainless steel spray paint, but it didn't hold up to the salt. I have a good friend who has access to IVD (Ionized Vaper Deposit) coating. Absolutely fantastic. It goes on steel , aluminum, titanium, anything. It is an aluminum coating that is done in a vacuum. It held up great. I can't tell you the cost, as mine was done as a favor. But one thing about it, you'll never have to worry about those parts again.
John